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        <h1 class="page_title">chrome.experimental.devtools.audits</h1>
        
        
        
        <div id="toc">
          <h2>Contents</h2>
          <ol>
            <li>
              <a href=#overview>Overview</a>
            </li>
            <li>
              <a href=#examples>Examples</a>
            </li>
            <li>
              <a href="#apiReference">API reference: chrome.experimental.devtools.audits</a>
              <ol>
                  <li><a href="#types">Types</a><ol>  <li>    <a href="#type-AuditCategory">AuditCategory</a><ol><li>      <a href="#AuditCategory-events">Events</a>      <ol>        <li><a href="#event-AuditCategory-onAuditStarted">onAuditStarted</a></li>      </ol>    </li></ol>  </li>  <li>    <a href="#type-FormattedValue">FormattedValue</a>  </li>  <li>    <a href="#type-AuditResults">AuditResults</a><ol><li>      <a href="#AuditResults-methods">Methods</a>      <ol>        <li><a href="#method-AuditResults-addResult">addResult</a></li>        <li><a href="#method-AuditResults-createResult">createResult</a></li>        <li><a href="#method-AuditResults-done">done</a></li>        <li><a href="#method-AuditResults-createURL">createURL</a></li>        <li><a href="#method-AuditResults-createSnippet">createSnippet</a></li>      </ol>    </li></ol>  </li>  <li>    <a href="#type-AuditResultNode">AuditResultNode</a><ol><li>      <a href="#AuditResultNode-methods">Methods</a>      <ol>        <li><a href="#method-AuditResultNode-addChild">addChild</a></li>      </ol>    </li></ol>  </li>  <li>    <a href="#type-AuditResultSeverity">AuditResultSeverity</a>  </li></ol></li>
                  
                  <li><a href="#methods">Methods</a><ol>  <li><a href="#method-addCategory">addCategory</a></li></ol></li>
                  
                  
              </ol>
            </li>
          </ol>
        </div>

<p id="classSummary">
Use the <code>chrome.experimental.devtools.audits</code> module to add new audit
categories to Developer Tools' Audit panel.
</p><p>
See <a href="experimental.devtools.html">DevTools APIs summary</a> for
general introduction to using Developer Tools APIs</a>.
</p>

<h2 id="overview">Overview</h2>

<p>
Each audit category is represented by a line on <em>Select audits to run</em>
screen in the Audits panel. The following example adds a category named
<em>Readability</em>:</p>
<pre>
var category = chrome.experimental.devtools.audits.addCategory("Readability", 2);
</pre>
<img src="stable/static/images/devtools-audits-category.png"
     style="margin-left: 20px"
     width="489" height="342"
     alt="Extension audit category on the launch screen of Audits panel" />
<p>
If the category's checkbox is checked, the <code>onAuditStarted</code> event of
that category will be fired when user clicks the <em>Run</em> button.
</p>
<p>The event handler in your extension receives <code>AuditResults</code>
as an argument and should add one or more results using <code>addResult()</code>
method. This may be done asynchronously, i.e. after the handler returns. The
run of the category is considered to be complete once the extension adds the
number of results declared when adding the  category with
<code>addCategory()</code> or
calls AuditResult's <code>done()</code> method.
</p>
<p>The results may include additional details visualized as an expandable
tree by the Audits panel. You may build the details tree using the
<code>createResult()</code> and <code>addChild()</code> methods. The child node
may include specially formatted fragments created by the
<code>auditResults.createSnippet()</code>
and <code>auditResults.createURL()</code> methods.
</p>

<h2 id="examples">Examples</h2>
<p>The following example adds a handler for onAuditStarted event that creates
two audit results and populates one of them with the additional details:
</p>

<pre>
category.onAuditStarted.addListener(function(results) {
  var details = results.createResult("Details...");
  var styles = details.addChild("2 styles with small font");
  var elements = details.addChild("3 elements with small font");

  results.addResult("Font Size (5)",
      "5 elements use font size below 10pt",
      results.Severity.Severe,
      details);
  results.addResult("Contrast",
                    "Text should stand out from background",
                    results.Severity.Info);
});
</pre>
<p>The audit result tree produced by the snippet above will look like this:
</p>
<img src="stable/static/images/devtools-audits-results.png"
     style="margin-left: 20px"
     width="330" height="169"
     alt="Audit results example" />

<p>
You can find more examples that use this API in
<a href="samples.html#devtools.audits">Samples</a>.
</p>
        <h2 id="apiReference">API Reference: chrome.experimental.devtools.audits</h2>
        <div class="api_reference">
            <h3 id="types">Types</h3>
              <div>
                <h3 id="type-AuditCategory">AuditCategory</h3>
                <div>
                  <dt><span class="type_name">  (    <span id="typeTemplate">object</span>  )</span></dt>
              <dd>
                    A group of logically related audit checks.
                  </dd>    <h4 id="AuditCategory-events">
                    Events of <a href="#type-AuditCategory">AuditCategory</a>
                  </h4>
                  <dd><dl>      <div>
                      <h4 id="event-AuditCategory-onAuditStarted">onAuditStarted</h4>
                      <div class="summary">
                        <span class="subdued">AuditCategory.</span>onAuditStarted<span class="subdued">.addListener</span>(function(<span><a href="experimental.devtools.audits.html#type-AuditResults">AuditResults</a> <span class="variable">results</span></span>)<span class="subdued"> {...}</span>);
                      </div>
                      <div class="description">
                    <p>
                          If the category is enabled, this event is fired when the audit is started. The event handler is expected to initiate execution of the audit logic that will populate the <code>results</code> collection.
                        </p>      <h4>Listener Parameters</h4>
                          <dl>
                            <div>  <a name="property-onAuditStarted-results"></a>  <dt>    <span class="variable">results</span>    <span class="property">      (                <span id="typeTemplate"><a href="experimental.devtools.audits.html#type-AuditResults">AuditResults</a></span>      )    </span>  </dt></div>
                          </dl>
                      </div>
                    </div>
              </dl></dd>
                </div>
              </div>
              <div>
                <h3 id="type-FormattedValue">FormattedValue</h3>
                <div>
                  <dt><span class="type_name">  (    <span id="typeTemplate">object</span>  )</span></dt>
              <dd>
                    A value returned from one of the formatters (a URL, code snippet etc), to be passed to <code>createResult()</code> or <code>addChild()</code>. See <a href="#method-AuditResults-createSnippet"><code>createSnippet()</code></a> and <a href="#method-AuditResults-createURL"><code>createURL()</code></a>.
                  </dd>  </div>
              </div>
              <div>
                <h3 id="type-AuditResults">AuditResults</h3>
                <div>
                  <dt><span class="type_name">  (    <span id="typeTemplate">object</span>  )</span></dt>
              <dd>
                    A collection of audit results for the current run of the audit category.
                  </dd>    <h4 id="AuditResults-properties">
                    Properties of <a href="#type-AuditResults">AuditResults</a>
                  </h4>
                  <dd><dl>      <div>
                      <a name="property-AuditResults-Severity"></a>
                      <dt>
                        <span class="variable">Severity</span>
                        <span class="property">
                          (
                            
                            <span id="typeTemplate"><a href="experimental.devtools.audits.html#type-AuditResultSeverity">AuditResultSeverity</a></span>
                          )
                        </span>
                      </dt>
                      <dd>
                        A class that contains possible values for the audit result severities.
                      </dd>
                    </div>
                    <div>
                      <a name="property-AuditResults-text"></a>
                      <dt>
                        <span class="variable">text</span>
                        <span class="property">
                          (
                            
                            <span id="typeTemplate">string</span>
                          )
                        </span>
                      </dt>
                      <dd>
                        The contents of the node.
                      </dd>
                    </div>
                    <div>
                      <a name="property-AuditResults-children"></a>
                      <dt>
                        <span class="variable">children</span>
                        <span class="property">
                          (
                            <span class="optional">optional</span>
                            <span id="typeTemplate">array of <a href="experimental.devtools.audits.html#type-AuditResultNode">AuditResultNode</a></span>
                          )
                        </span>
                      </dt>
                      <dd>
                        Children of this node.
                      </dd>
                    </div>
                    <div>
                      <a name="property-AuditResults-expanded"></a>
                      <dt>
                        <span class="variable">expanded</span>
                        <span class="property">
                          (
                            <span class="optional">optional</span>
                            <span id="typeTemplate">boolean</span>
                          )
                        </span>
                      </dt>
                      <dd>
                        Whether the node is expanded by default.
                      </dd>
                    </div>
              </dl></dd>
                  <h4 id="AuditResults-methods">
                    Methods of <a href="#type-AuditResults">AuditResults</a>
                  </h4>
                  <dd><dl>      <div>
                      <h4 id="method-AuditResults-addResult">addResult</h4>
                      <div class="summary lower">
                        <span>AuditResults.addResult</span>(<span>string <span class="variable">displayName</span></span>, <span>string <span class="variable">description</span></span>, <span><a href="experimental.devtools.audits.html#type-AuditResultSeverity">AuditResultSeverity</a> <span class="variable">severity</span></span>, <span class="optional"><a href="experimental.devtools.audits.html#type-AuditResultNode">AuditResultNode</a> <span class="variable">details</span></span>)
                      </div>
                      <div class="description">
                    <p>
                          Adds an audit result. The results are rendered as bulleted items under the audit category assoicated with the <code>AuditResults</code> object.
                        </p>    <h4>Parameters</h4>
                        <dl>
                          <div>  <a name="property-addResult-displayName"></a>  <dt>    <span class="variable">displayName</span>    <span class="property">      (                <span id="typeTemplate">string</span>      )    </span>  </dt>  <dd>    A concise, high-level description of the result.  </dd></div><div>  <a name="property-addResult-description"></a>  <dt>    <span class="variable">description</span>    <span class="property">      (                <span id="typeTemplate">string</span>      )    </span>  </dt>  <dd>    A detailed description of what the displayName means.  </dd></div><div>  <a name="property-addResult-severity"></a>  <dt>    <span class="variable">severity</span>    <span class="property">      (                <span id="typeTemplate"><a href="experimental.devtools.audits.html#type-AuditResultSeverity">AuditResultSeverity</a></span>      )    </span>  </dt></div><div>  <a name="property-addResult-details"></a>  <dt>    <span class="variable">details</span>    <span class="property">      (        <span class="optional">optional</span>        <span id="typeTemplate"><a href="experimental.devtools.audits.html#type-AuditResultNode">AuditResultNode</a></span>      )    </span>  </dt>  <dd>    A subtree that appears under the added result that may provide additional details on the violations found.  </dd></div>
                        </dl>
                        
                      </div>
                    </div>
                    <div>
                      <h4 id="method-AuditResults-createResult">createResult</h4>
                      <div class="summary">
                        <span><a href="experimental.devtools.audits.html#type-AuditResultNode">AuditResultNode</a> AuditResults.createResult</span>(<span><a href="experimental.devtools.audits.html#type-FormattedValue">FormattedValue</a> or string <span class="variable">content ...</span></span>)
                      </div>
                      <div class="description">
                    <p>
                          Creates a result node that may be used as the <code>details</code> parameters to the <code>addResult()</code> method.
                        </p>    <h4>Parameters</h4>
                        <dl>
                          <div>  <a name="property-createResult-content ..."></a>  <dt>    <span class="variable">content ...</span>    <span class="property">      (                <span id="typeTemplate"><a href="experimental.devtools.audits.html#type-FormattedValue">FormattedValue</a> or string</span>      )    </span>  </dt>  <dd>    Either string or formatted values returned by one of the AuditResult formatters (a URL, a snippet etc). If multiple arguments are passed, these will be concatenated into a single node.  </dd></div>
                        </dl>
                        
                      </div>
                    </div>
                    <div>
                      <h4 id="method-AuditResults-done">done</h4>
                      <div class="summary lower">
                        <span>AuditResults.done</span>()
                      </div>
                      <div class="description">
                    <p>
                          Signals the DevTools Audits panel that the run of this category is over. The audit run also completes automatically when the number of added top-level results is equal to that declared when AuditCategory was created.
                        </p>  </div>
                    </div>
                    <div>
                      <h4 id="method-AuditResults-createURL">createURL</h4>
                      <div class="summary">
                        <span><a href="experimental.devtools.audits.html#type-FormattedValue">FormattedValue</a> AuditResults.createURL</span>(<span>string <span class="variable">href</span></span>, <span class="optional">string <span class="variable">displayText</span></span>)
                      </div>
                      <div class="description">
                    <p>
                          Render passed value as a URL in the Audits panel.
                        </p>    <h4>Parameters</h4>
                        <dl>
                          <div>  <a name="property-createURL-href"></a>  <dt>    <span class="variable">href</span>    <span class="property">      (                <span id="typeTemplate">string</span>      )    </span>  </dt>  <dd>    A URL that appears as the href value on the resulting link.  </dd></div><div>  <a name="property-createURL-displayText"></a>  <dt>    <span class="variable">displayText</span>    <span class="property">      (        <span class="optional">optional</span>        <span id="typeTemplate">string</span>      )    </span>  </dt>  <dd>    Text that appears to the user.  </dd></div>
                        </dl>
                        
                      </div>
                    </div>
                    <div>
                      <h4 id="method-AuditResults-createSnippet">createSnippet</h4>
                      <div class="summary">
                        <span><a href="experimental.devtools.audits.html#type-FormattedValue">FormattedValue</a> AuditResults.createSnippet</span>(<span>string <span class="variable">text</span></span>)
                      </div>
                      <div class="description">
                    <p>
                          Render passed text as a code snippet in the Audits panel.
                        </p>    <h4>Parameters</h4>
                        <dl>
                          <div>  <a name="property-createSnippet-text"></a>  <dt>    <span class="variable">text</span>    <span class="property">      (                <span id="typeTemplate">string</span>      )    </span>  </dt>  <dd>    Snippet text.  </dd></div>
                        </dl>
                        
                      </div>
                    </div>
              </dl></dd>
                </div>
              </div>
              <div>
                <h3 id="type-AuditResultNode">AuditResultNode</h3>
                <div>
                  <dt><span class="type_name">  (    <span id="typeTemplate">object</span>  )</span></dt>
              <dd>
                    A node in the audit result tree. Displays content and may optionally have children nodes.
                  </dd>    <h4 id="AuditResultNode-properties">
                    Properties of <a href="#type-AuditResultNode">AuditResultNode</a>
                  </h4>
                  <dd><dl>      <div>
                      <a name="property-AuditResultNode-expanded"></a>
                      <dt>
                        <span class="variable">expanded</span>
                        <span class="property">
                          (
                            
                            <span id="typeTemplate">boolean</span>
                          )
                        </span>
                      </dt>
                      <dd>
                        If set, the subtree will always be expanded.
                      </dd>
                    </div>
              </dl></dd>
                  <h4 id="AuditResultNode-methods">
                    Methods of <a href="#type-AuditResultNode">AuditResultNode</a>
                  </h4>
                  <dd><dl>      <div>
                      <h4 id="method-AuditResultNode-addChild">addChild</h4>
                      <div class="summary">
                        <span><a href="experimental.devtools.audits.html#type-AuditResultNode">AuditResultNode</a> AuditResultNode.addChild</span>(<span><a href="experimental.devtools.audits.html#type-FormattedValue">FormattedValue</a> or string <span class="variable">content ...</span></span>)
                      </div>
                      <div class="description">
                    <p>
                          Adds a child node to this node.
                        </p>    <h4>Parameters</h4>
                        <dl>
                          <div>  <a name="property-addChild-content ..."></a>  <dt>    <span class="variable">content ...</span>    <span class="property">      (                <span id="typeTemplate"><a href="experimental.devtools.audits.html#type-FormattedValue">FormattedValue</a> or string</span>      )    </span>  </dt>  <dd>    Either string or formatted values returned by one of the AuditResult formatters (URL, snippet etc). If multiple arguments are passed, these will be concatenated into a single node.  </dd></div>
                        </dl>
                        
                      </div>
                    </div>
              </dl></dd>
                </div>
              </div>
              <div>
                <h3 id="type-AuditResultSeverity">AuditResultSeverity</h3>
                <div>
                  <dt><span class="type_name">  (    <span id="typeTemplate">object</span>  )</span></dt>
              <dd>
                    This type contains possible values for a result severity. The results of different severities are distinguished by colored bullets near the result's display name.
                  </dd>    <h4 id="AuditResultSeverity-properties">
                    Properties of <a href="#type-AuditResultSeverity">AuditResultSeverity</a>
                  </h4>
                  <dd><dl>      <div>
                      <a name="property-AuditResultSeverity-Info"></a>
                      <dt>
                        <span class="variable">Info</span>
                        <span class="property">
                          (
                            
                            <span id="typeTemplate">string</span>
                          )
                        </span>
                      </dt>
                    </div>
                    <div>
                      <a name="property-AuditResultSeverity-Warning"></a>
                      <dt>
                        <span class="variable">Warning</span>
                        <span class="property">
                          (
                            
                            <span id="typeTemplate">string</span>
                          )
                        </span>
                      </dt>
                    </div>
                    <div>
                      <a name="property-AuditResultSeverity-Severe"></a>
                      <dt>
                        <span class="variable">Severe</span>
                        <span class="property">
                          (
                            
                            <span id="typeTemplate">string</span>
                          )
                        </span>
                      </dt>
                    </div>
              </dl></dd>
                </div>
              </div>
            <h3 id="methods">Methods</h3>
              <div>
                <h4 id="method-addCategory">addCategory</h4>
                <div class="summary">
                  <span><a href="experimental.devtools.audits.html#type-AuditCategory">AuditCategory</a> chrome.experimental.devtools.audits.addCategory</span>(<span>string <span class="variable">displayName</span></span>, <span>double <span class="variable">resultCount</span></span>)
                </div>
                <div class="description">
              <p>
                    Adds an audit category.
                  </p>    <h4>Parameters</h4>
                  <dl>
                    <div>  <a name="property-addCategory-displayName"></a>  <dt>    <span class="variable">displayName</span>    <span class="property">      (                <span id="typeTemplate">string</span>      )    </span>  </dt>  <dd>    A display name for the category.  </dd></div><div>  <a name="property-addCategory-resultCount"></a>  <dt>    <span class="variable">resultCount</span>    <span class="property">      (                <span id="typeTemplate">double</span>      )    </span>  </dt>  <dd>    The expected number of audit results in the category.  </dd></div>
                  </dl>
                  
                </div>
              </div>
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